Isothermal vapor-liquid equilibrium data for the binary mixture difluoromethane (HFC-32) + ethyl fluoride (HFC-161) over a temperature range from 253.15 K to 303.15 K Han, X.h.; Gao, Z.j.; Xu, Y.j.; Qiu, Y.; Min, X.w.; Wang, Q.; Chen, G.m.; Fluid Phase Equilibria 2010, 299, 116-121